Under iTunes there is the 2.0.2 software link up, this is expected to solve 3G reception issues. Wait for Pwnage Tool to support it before updating if your unlocked or jailbroken. Download link for first generation iPhone here.

Do not update if your pwned. The Dev Team has previously stated that upgrading non pwnd firmware in iTunes to any version past 2.0 may lessen your chances of being able to unlock in the future